JPH10296972A - Ink jet head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a manufacturing method excellent in productivity by bonding the barrier wall of an ink chamber through metal diffusion bonding and ensuring the dimensions of channel thereby making constant the characteristics among a plurality of channels. SOLUTION: Ink is passed through a plate 5 and the channel 9 in a chamber plate 7 by the differential head between the ink and a head and the capillarity and a pressurization chamber 11 comprising a diaphragm 6, the chamber plate 7 and an orifice plate is filled with the ink. The diaphragm 6 is connected with an electrostrictive element 2 fixed to a board 1 being held through a spacer 19. A drive circuit applies an electric signal to the electrostrictive element 2 in order to generate a mechanical displacement for deforming the diaphragm 6 through a foot 3. The pressurization chamber 11 is deformed in the direction for reducing the volume thereof and an ink droplet is jetted through an orifice made in an orifice plate 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ink jet head.

[0002]

2. Description of the Related Art Conventional ink jet heads use, for example, an epoxy-based adhesive to join barrier ribs, so that it is necessary to control the amount of adhesive applied, and the amount is too large. In such a case, narrow the ink flow path,
There was an evil to block. In particular, in the case of a single ink jet head having a large number of orifices, the required performance cannot be obtained with one orifice at any one place, so that the ink jet head is defective.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the characteristics between a plurality of channels can be improved by bonding the partition walls of the ink chamber without using a bonding means such as an adhesive and securing a desired flow path size. An object of the present invention is to provide a method of manufacturing an inkjet head which is constant and has good productivity.

[0004]

By forming the members constituting the partition walls of the ink chamber from metal, it is possible to perform bonding by intermolecular bonding force between metals, so-called metal diffusion bonding.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a sectional view of an ink jet head according to the present invention. Ink is supplied from a not-shown ink supply tank to a common ink chamber 10 provided on the holding plate 4, and the ink passes through the flow path 9 of the plate 5 and the chamber plate 7 due to the head difference between the ink and the head and the capillary phenomenon. The pressure is filled in the pressurizing chamber 11 composed of the diaphragm 6, the chamber plate 7 and the orifice plate 12. The diaphragm 6 is connected to the electrostrictive element 2 attached to the substrate 1 held by the spacer 19 via the foot 3 via the foot 3, and an electric signal is applied to the electrostrictive element 2 by a drive circuit (not shown). As a result, a mechanical displacement is generated in the electrostrictive element 2, and the diaphragm 6 is moved through the rigid foot 3.
To transform. The deformation of the pressurizing chamber 11 occurs in the direction of reducing its volume, and ink droplets are ejected from the orifice 8 provided in the orifice plate 12. FIG. 1 shows a well-known so-called on-demand type ink jet head. FIG. 2 is a plan view of each component of the on-demand head described in FIG. The orifice plate 12 is provided with a desired number of orifices 8. In the chamber plate 7, a through hole 13 for forming the pressurized chamber 11 and a flow channel 14 for forming the ink supply flow channel 9 are dug. The diaphragm 6 has a passage hole 15 for forming the passage 9. In the plate 5, a through hole 16 for the foot 3 and the electrostrictive element 2 to enter and a flow channel groove 17 for forming the flow channel 9 are dug. A common ink chamber groove 18 serving as the common ink chamber 10 is dug into the holding plate 4.

After cleaning to remove oils and the like adhering to the surface of these head components, they are arranged as shown in FIG. 3 and placed in a vacuum furnace for metal diffusion bonding.
By setting the inside of the furnace at a high temperature and a high pressure, the connection portion of each component becomes an alloy state, and reliable joining can be performed. At this time, it is not necessary to use an adhesive or the like for joining, and the finely processed channel 9 will not be blocked unexpectedly.

[0008]

According to the present invention, it is possible to manufacture an ink jet head having uniform characteristics between channels without using a bonding means such as an adhesive.

[Brief description of the drawings]

FIG. 1 is a sectional view of an inkjet head according to the present invention.

FIG. 2 is an explanatory diagram of an inkjet head according to the present invention.

FIG. 3 is a layout diagram of an inkjet head according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... board, 2 ... electrostrictive element, 3 ... foot, 4 ... holding plate,
5: plate, 6: diaphragm, 7: chamber plate, 8: orifice, 9: flow path, 10: common ink chamber,
11: pressurized chamber, 12: orifice plate, 19: spacer.

Claims (1)

[Claims] 1. A pressure is applied to an orifice plate having a plurality of orifices, a chamber plate having a number of ink chambers corresponding to the orifices, a plate forming an ink flow path, and ink held in the ink chamber. Ink jet head comprising a diaphragm plate for joining the components of the head by metal diffusion bonding.